mirror of https://github.com/ARMmbed/mbed-os.git
15 lines
868 B
Markdown
15 lines
868 B
Markdown
# Testing the USB device data toggle reset with a Linux host
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When you run the `tests-usb_device-basic` test suite on a Linux machine, please make
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sure that at least one of the following prerequisites are met:
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* using the Linux kernel ***4.17* or newer**,
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* using the ***eHCI*** USB driver instead of *xHCI*.
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Implementations of the *xHCI* driver prior to version 4.17 of the Linux kernel did
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not have the functionality necessary to test `"endpoint test data toggle reset"`.
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Even though the data toggle is correctly reset on the device side, the host side will
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not be synchronized and the test will falsely fail.
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Further reading:
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1. [the Linux kernel patch adding missing xHCI behavior](https://github.com/torvalds/linux/commit/f5249461b504d35aa1a40140983b7ec415807d9e),
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1. [LKML discussion explaining the details of this issue](https://lkml.org/lkml/2016/12/15/388). |